// 导出页面为PDF格式
import html2Canvas from 'html2canvas';
import JsPDF from 'jspdf';

export default function (dom, title) {
	//将弹窗body滚动到顶部，不然会截图不全
	return new Promise((resolve, reject) => {
		dom.scrollTop = 0;
		html2Canvas(dom, {
			allowTaint: true,
			useCORS: true,
			height: dom.scrollHeight + dom.offsetHeight,
			windowHeight: dom.scrollHeight + dom.offsetHeight,
			onclone: function (html) {
				//将明细表展开
				let detailTableList = html.querySelectorAll('.fks-table');
				if (detailTableList && detailTableList.length) {
					detailTableList.forEach((item) => {
						item.style.maxHeight = '10000px';
						let tableBody = item.querySelector('.fks-table__body-wrapper');
						tableBody.style.maxHeight = '10000px';
					});
				}
			}
		}).then(function (canvas) {
			let contentWidth = canvas.width;
			let contentHeight = canvas.height;
			//A4纸宽度为592.28，高度为841.89
			let pageHeight = (contentWidth / 592.28) * 841.89;
			let leftHeight = contentHeight;
			let position = 0;
			let imgWidth = 595.28;
			let imgHeight = (592.28 / contentWidth) * contentHeight;
			let pageData = canvas.toDataURL('image/jpeg', 1.0);
			let PDF = new JsPDF('', 'pt', 'a4');
			if (leftHeight < pageHeight) {
				PDF.addImage(pageData, 'JPEG', 0, 0, imgWidth, imgHeight);
			} else {
				while (leftHeight > 0) {
					PDF.addImage(pageData, 'JPEG', 0, position, imgWidth, imgHeight);
					leftHeight -= pageHeight;
					position -= 841.89;
					if (leftHeight > 0) {
						PDF.addPage();
					}
				}
			}
			PDF.save(title + '.pdf');
			resolve();
		});
	});
}
